A scientist named Bruce Kimball has come up with a way to track the spread of Bird Flu, a disease that can be dangerous to humans.

Follow the poop, he says. Duck droppings, to be specific.

Bird flu, which is also called avian influenza, is caused by viruses carried around by birds. These viruses are contagious, which means Bird Flu can spread from wild birds to birds kept by people, such as chickens and some ducks. The disease can also make human beings sick, and scientists such as Ki...